net: qrtr: Do not send packets before hello negotiation

There is a race where broadcast packets can be sent to a node that has
not sent the hello message to the remote processor. This breaks the
protocol expectation. Add a status variable to track when the hello
packet has been sent.

An alternative solution attempted was to remove the nodes from the
broadcast list until the hello packet is sent. This is not a valid
solution because hello messages are broadcasted if the ns is restarted
or started late. There needs to be a status variable separate from the
broadcast list.

This change squashes the following commits from msm-4.14:
  commit abd3961d05be ("qrtr: Only broadcast to initialized nodes")
  commit 90cb0e473226 ("net: qrtr: Do not send packets before Hello
                        negotiation")
  commit 07abd1abe803 ("net: qrtr: Fix hello packet drop memory leak")

In addition, fix minor format issues.

Change-Id: I2a55e587f324e64e2bde4ea634de66008f190de1
Signed-off-by: Chris Lew <clew@codeaurora.org>